package com.gucheng.ggrpc.server;

import com.gucheng.ggrpc.model.RpcRequest;
import com.gucheng.ggrpc.model.RpcResponse;
import com.gucheng.ggrpc.registry.LocalRegistry;
import com.gucheng.ggrpc.serializer.JdkSerializer;
import com.gucheng.ggrpc.serializer.Serializer;
import io.vertx.core.Handler;
import io.vertx.core.buffer.Buffer;
import io.vertx.core.http.HttpServerRequest;
import io.vertx.core.http.HttpServerResponse;

import java.io.IOException;
import java.lang.reflect.Method;


public class HttpServerHandler implements Handler<HttpServerRequest> {
    @Override
    public void handle(HttpServerRequest request) {
        //指定序列化器
        final Serializer serializer = new JdkSerializer();

        //记录日志
        System.out.println("接收请求：" + request.method() + " " + request.uri());

        //异步处理 HTTP 请求
        request.bodyHandler(body -> {
            byte[] bytes = body.getBytes();
            RpcRequest rpcRequest = null;
            try {
               rpcRequest =serializer.deserialize(bytes, RpcRequest.class);
            } catch (Exception e) {
                e.printStackTrace();
            }

            //构建响应结果对象
            RpcResponse rpcResponse = new RpcResponse();
            //如果请求为null,直接返回
            if (rpcRequest == null) {
                rpcResponse.setMessage("rpcRequest is null");
                doResponse(request, rpcResponse, serializer);
                return;
            }

            try {
                //获取要调用的服务实现类，通过反射调用
                Class<?> implClass = LocalRegistry.get(rpcRequest.getServiceName());
                Method method = implClass.getMethod(rpcRequest.getMethodName(), rpcRequest.getParameterTypes());
                Object result = method.invoke(implClass.newInstance(), rpcRequest.getArgs());
                // 封装返回结果
                rpcResponse.setData(result);
                rpcResponse.setDataType(method.getReturnType());
                rpcResponse.setMessage("成功");
            }catch (Exception e){
              e.printStackTrace();
              rpcResponse.setMessage(e.getMessage());
              rpcResponse.setException(e);
            }
            //响应
            doResponse(request, rpcResponse, serializer);
        });

    }

    /**
     *  响应
     * @param request
     * @param rpcResponse
     * @param serializer
     */
    private void doResponse(HttpServerRequest request, RpcResponse rpcResponse, Serializer serializer) {
        HttpServerResponse httpServerResponse = request.response()
                .putHeader("content-type", "application/json");
        try {
            //序列化
            byte[] serialized = serializer.serialize(rpcResponse);
            httpServerResponse.end(Buffer.buffer(serialized));
        }catch (IOException e){
            e.printStackTrace();
            httpServerResponse.end(Buffer.buffer());
        }
    }
}
